My view of the human nature
Human is a very complicated topic to discuss. There are many different angles to approach. However in my opinion, the fact that affects humans the most is their personal experience of person. These past experiences tell how well you view life, your personality, etc and can very well explain the nature of that specific human.
What usually affects your behaviors the most is during childhood. You learn basic actions and as you get older, you learn different skills and also develop your interests. However at this point of your life, it can also create bias and it can make you develop some very unnecessary thoughts about other things such as racism, religions, etc. Although you can develop these things when you are a teenager or older, your childhood is a very important time of your life for it is the first time you actually experience these types of thoughts and the first time you can make a decision of where you might lean towards to.
Another huge factor that can happen spontaneously is when those experiences become a part of your life. When someone close of yours died or you just got dumped by your first boyfriend, this can affect something deep in your mind that can have a long-term effect on you. You can feel as if the world is against you and that will definitely change your human nature dramatically.
As I said before human nature is ever-changing and is mostly self-interested for you experience it yourself. So if your view of mankind is a dreary one, you can still change it but it will require you more work for you have many directions that you to decide on. That is why your parents try to teach you in the right direction in their eyes. Although their ideas might not be the same as yours, they do have experience in this for being much older than you.
Even though all of these factors can affect your view of life and human nature, you have one powerful option which is choice....